Sweep 19 Sep 2026 · 02:36Z Build v2.1.278 500 read Stable v2.1.267 Latest v2.1.278 Next v2.1.278 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.271 ·

New model-pattern-gated nudge encouraging judicious subagent delegation ('lucky_cerf')

New guidance nudges Claude to weigh the real cost before spawning a subagent

TierNothing to try yethow much it should matter to you
Useful2my rating, 1 to 5
Signal3worth watching, 1 to 5
AreaSubagentswhat it touches
KindIn Developmentin v2.1.271,
Nothing to try yet

New guidance nudges Claude to weigh the real cost before spawning a subagent

What

A new gate can enable, per model, a block of guidance text shown or injected to Claude about when it's worth delegating work to a subagent versus handling it directly. The text includes lines like "A fresh agent costs more than it looks," discussing the tradeoffs of spawning agents.

Why

This is meant to make Claude more judicious about creating subagents, weighing their overhead against just doing the work inline, which could reduce unnecessary agent spawning when it isn't worth the cost.

Read from
Feature flag
tengu_lucky_cerf Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.271: not a boolean we can read

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

tengu_lucky_cerf_text Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.271: not a boolean we can read

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.271. It isn't a statement about your account. What a flag value here can and cannot tell you

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtNothing has been read yet about how the tengu_lucky_cerf or tengu_lucky_cerf_text gates are currently set for this site's account, so no…
The name it cites is new in this buildNew in this build: tengu_lucky_cerf

See this entry in the whole of v2.1.271 →